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Performance Verification
4–66
1780R-Series Service Manual
Figure 4–13: Setting up the Return Loss Bridge: a) setup 500 mV amplitude; b)
Nulling the bridge
NOTE. The Return Loss Bridge must null within 0.5 mV. If the Bridge does not
null within this amplitude, the Bridge must be recalibrated before checking the
1780R-Series instrument return loss.
e. Remove the Red terminator from the Unknown arm. Connect the
Unknown arm to the 1780R-Series CH A INPUT. Connect the Red
terminator to the opposite side of the CH A INPUT loop-through
connector. See Figure 4–14.